Normal for a 1yr old ?

Is it normal for a 1 yr old to always play with the toys upside down or reverse ?

Like say, baby topples over his push walker & plays with the back side of it (though he pushes n walks with it also) . Like wise, his toy xylophone is always upside down & he pokes the backside (though he plays on the proper side also) .

Other toys he plays ok - like small cars, bikes.