The Spectral Platform is a block added by Botania. It has no physical body, and is similar to the Abstruse Platform; everything will go through it on any side. Its entry in the Lexica Botanica is hidden until the player acquires Elven Knowledge.
The Spectral Platform can also be camouflaged to take on the appearance of another block; right-click the platform with the desired block to be camouflaged as. The block used to camouflage the platform will stay in the player's hand. To change its appearance, right-click with another block while looking at the Spectral Platform.