No. LXXIII.—AN ILLUSION OF ARCHES
This excellent illusion appeared in a recent number of the “Strand Magazine”:—
Most persons will at first see the passages under these arches as running upwards from left to right, but presently, as their line of vision shifts, the arches will take a downward course from right to left. This very curious effect will well repay a little patience, if it is not realised at once.