Retro techo hypno

I bought my husband a Lava Lamp for Christmas. He had wanted one for ages, so I tracked one down and he was really chuffed with it. I do (almost) remember when they were in fashion in the 70's !! Anyway, I sat staring at it tonight, mesmerised by the shapes and colours. Next thing I knew, it was 7pm, and I had been asleep on the sofa for well over an hour. !