Phantascope Phantascope
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A combined pocket size Hyperscope & Psudoscope,
and more.

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Demonstration - Observing the Effects

The most obvious effect through the hyperscope is that of a startlingly enhanced stereoscopic image; space seems bigger, while objects appear sharper and dramatically lilliputian. The perception of gradients and depth levels is heightened and, as we have seen, the range of stereoscopic discrimination is extended to many times that of unaided vision.

An effective test/demonstration with new subjects who may at first be visually inhibited is to stand about 10 ft (3m) away from them and ask them to look at you through the Hyperscope. Hold your hand, with fingers apart, in front of your face, with the back of your hand touching your nose, and ask them to estimate the distance between your hand and your face. Most answers are between 6 inches (15cm) and 2 ft (61cm) or more, and you will find it useful, keeping your hand pressed against your face, to turn sideways to convince them. Some subjects try to calculate the distance from the bend in your arm, but that's thinking not seeing.

Size Constancy and The Lilliputian Effect

The apparent size of an object is profoundly related to the distance at which the object is perceived to be. When the distance of an object from an observer changes it will tend to appear about the same size. One of the best-known examples of this is the "moon illusion". Although the actual size of the moon's image on the retina is identical when the moon is at zenith and on the horizon, it is perceived as larger when on the horizon. This is because the horizon makes it seem further away from the observer and therefore larger.

After the previous demonstration, instead of holding your hand against your face, extend your arm full length towards the observer. Not only will it now appear to be several feet long, but your hand, instead of being larger, will appear diminished in size.

This is an effect of 'mis-applied constancy scaling ' which can be described like this: in normal vision, as the distance between the observer and the target decreases so the size of the retinal image increases.

Through a Hyperscope, however, because of the compensation for enhanced depth, even though the image gets bigger because of its approach, its depth decreases more rapidly. Size seems to be connected to the retinal image, but is actually related to the distorted depth change, and not the real depth change. Using the increased depth to discount too much depth, modifies the 'seeing correction factor' which the brain is generating to discount size changes - so you see the correction factor.